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I think you can find some info in this series:
https://www.youtube.com/watch?v=wdgULBpRoXk

https://www.youtube.com/watch?v=2lPzTU-3ONI
Look for nkey roll over descriptor...

Along buffer size, you need to change in hid_desc.bas:


ReportDescriptor1
retlw 0x05
retlw 0x01 ; usage page (generic desktop)
retlw 0x09
retlw 0x06 ; usage (keyboard)...

It is not so easy to change buffer. You must change descriptor file, not just length(If I understand usb correctly).

You can send one letter and modifier key at time.

Use this


For i = 0...

I used it on win7, and if I remember correctly on XP. It should work on win10.
You have keys.PBP, with all defined keys, also in .doc document you have codes.

Also USBSERVICE should be called...

I made keyboard to use as shortcuts for EAGLE. Should be exactly what you need. I used it on easypic dev board. Pic should be 18F4550.
Here is complete project 9108

I created that using many...